Quote:
Originally Posted by Icelander
I have not, no. Natural rubber exists, that's as far as I've thought. I did consider its use in mechanical artillery, but the established fact that it grows nowhere it is easy to get to from the Inner Sea makes it unavoidably expensive.
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Looking at two real-world sources, there are vines that one cannot cultivate at all, and trees that are relatively easy to cultivate. If the PCs find rubber to be of value, there may be some sort of adventure to get some seeds home.